The Introduction of Inversion of Polarity Sites in DNA G-Quadruplex Structures: Effects and Perspectives

Author(s): Antonella Virgilio, Veronica Esposito, Rosanna Filosa, Luciano Mayol, Aldo Galeone

Journal Name: Mini-Reviews in Medicinal Chemistry

Volume 16 , Issue 7 , 2016

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The natural sequences of nucleic acids generally consist of nucleotides linked together by canonical 3'-5' phosphodiester bonds. An inversion of polarity site (IPS) can be defined as the point of the sequence in which a 3'-3' or a 5'-5' phosphodiester bond occurs. By extending this definition, an IPS can be described as that part of the sequence in which two 3'- or two 5'-hydroxyl groups are connected by a linker, variable in size or in chemical nature. In G-quadruplex structures an IPS can be introduced in three different positions: inside a non G-tract, inside a G-tract and just between a non Gtract and a G-tract. Investigations have been reported concerning all the three types of modification. This review describes the effects of the presence of one or more IPSs in G-quadruplex structures, particularly regarding their topological and structural characteristics, glycosidic bond preference, and thermal stability, with special attention to biologically active Gquadruplex forming aptamers. The perspectives and potential developments of this research area are also discussed.

Keywords: Aptamers, G-quadruplex, inversion of polarity site.

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Article Details

Year: 2016
Page: [509 - 523]
Pages: 15
DOI: 10.2174/1389557515666150909143215
Price: $65

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PDF: 21
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